From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7DC67C433E6 for ; Fri, 15 Jan 2021 22:05:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4E6A3239EE for ; Fri, 15 Jan 2021 22:05:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727290AbhAOWEr (ORCPT ); Fri, 15 Jan 2021 17:04:47 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49698 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727072AbhAOWEq (ORCPT ); Fri, 15 Jan 2021 17:04:46 -0500 Received: from mail-qv1-xf4a.google.com (mail-qv1-xf4a.google.com [IPv6:2607:f8b0:4864:20::f4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A9DBFC061798 for ; Fri, 15 Jan 2021 14:04:03 -0800 (PST) Received: by mail-qv1-xf4a.google.com with SMTP id j24so9017259qvg.8 for ; Fri, 15 Jan 2021 14:04:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:reply-to:date:in-reply-to:message-id:mime-version:references :subject:from:to:cc; bh=945mZt11W/e1Cpr0kux35fc/oPlYVUnDMXl7cGh3YTM=; b=Yr1kAU4CG074m4dxfzKdbDRb4kKVYmOtLuUvFV4BkhGqFcrk+mQDMyPPg5uboFJ3Am wsLXuIay1J8LcDKkxThYDs+tX/wrEnaCXYHI2XtodoBK8qftJCm97N0mNUrrY3hBaL3a la48DizDpshlWYMoedKHESMVL/q/JXWPGrhZw+Jg+k+QPzfg96oT0B85TtwjTJGW1rNC n5o8DEmkzot0v9Ikh7XVZuH6yJWEFyCW7D8lAbNj7Y7ydcwPUtVeQ5drOj04QtMExVuU KUST7RwIFuHGmsLYMpFxRZgRs6Zjt4C8bZUDu38neVfW+UUqr/Hi97D+myZidRsO9JK/ NP0g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:reply-to:date:in-reply-to:message-id :mime-version:references:subject:from:to:cc; bh=945mZt11W/e1Cpr0kux35fc/oPlYVUnDMXl7cGh3YTM=; b=rJ3K5P93X2q0vzIQ9mnmuG+7/RVqn9ayZCt3PpnO1OQ2StOSgtP8i/FsPU8BF0XUIi 7ADLmThi0WKu4Mf9CbJGI00WjVjE833eKvBqCGx+ekk7t+g+YiMLbBL/952YUSzH/NkE YuunsXSEIAvfK1C8lJcuk9wo6zuT4AMPCRT0OTIrxeczZ8mqDu2ubJQU6EpqdxSs0ckO t+vffXaoQShi//tUkBw0EMk2zJ1jgsV8sSXfMAfk078nBCxaAAK/PBcS5zC8T7y4oA52 RO/JIWbZa9PcaJJfJrK73Ykcgeqjd4LCd+rIFJtbBao8klhrcKYOdeVuQZYfOPiT5ZMG xbRg== X-Gm-Message-State: AOAM531QUW/pr4TQW52QfyHk3KrjbqX2p37XLbttCgTPvOPco+aHrDm0 U4PLlmmxIvrgLDNgF/SCwCAZnXH4Gm4= X-Google-Smtp-Source: ABdhPJyt07jGMmHQFCoFeqGCZ1Bu0ZBh9pKPci86yZRNoZyB2kLRYs8TpCw2UxNarA98HdV3SjMy8aXFUys= Sender: "seanjc via sendgmr" X-Received: from seanjc798194.pdx.corp.google.com ([2620:15c:f:10:1ea0:b8ff:fe73:50f5]) (user=seanjc job=sendgmr) by 2002:ad4:4431:: with SMTP id e17mr13861250qvt.21.1610748242838; Fri, 15 Jan 2021 14:04:02 -0800 (PST) Reply-To: Sean Christopherson Date: Fri, 15 Jan 2021 14:03:53 -0800 In-Reply-To: <20210115220354.434807-1-seanjc@google.com> Message-Id: <20210115220354.434807-2-seanjc@google.com> Mime-Version: 1.0 References: <20210115220354.434807-1-seanjc@google.com> X-Mailer: git-send-email 2.30.0.284.gd98b1dd5eaa7-goog Subject: [PATCH 1/2] x86/apic: Export x2apic_mode for use by KVM in "warm" path From: Sean Christopherson To: Paolo Bonzini Cc: Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, luferry Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Export x2apic_mode so that KVM can query whether x2APIC is active without having to incur the RDMSR in x2apic_enabled(). When Posted Interrupts are in use for a guest with an assigned device, KVM ends up checking for x2APIC at least once every time a vCPU halts. KVM could obviously snapshot x2apic_enabled() to avoid the RDMSR, but that's rather silly given that x2apic_mode holds the exact info needed by KVM. Signed-off-by: Sean Christopherson --- arch/x86/kernel/apic/apic.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index 6bd20c0de8bc..dea2b44966ca 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -1743,6 +1743,7 @@ void apic_ap_setup(void) #ifdef CONFIG_X86_X2APIC int x2apic_mode; +EXPORT_SYMBOL_GPL(x2apic_mode); enum { X2APIC_OFF, -- 2.30.0.284.gd98b1dd5eaa7-goog